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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 448 (Engine Controls Self-Diagnostics - 6.0L Bi-Fuel & CNG) >> Diagnostic Tests >> DTC P1207: Fuel Rail Pressure Output PWM Signal Not Received By Pcm >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Injector Control Module (FICM) monitors the fuel rail pressure (FRP) sensor voltage, and the Fuel Rail Temperature (FRT) sensor voltage. The FICM communicates the data to the PCM by dedicated Pulse Width Modulated (PWM) circuits. This DTC sets when the rail pressure output PWM signal is not received by the PCM.

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